Hanna Instruments HI 93715 - Manual (Page 2)

The instruction listed below should be carefully followed
during testing to ensure best accuracy.
• Do not touch the cuvet walls with hands.
• In order to maintain the same conditions during the
zeroing and the measuring phases, it is necessary to
close the cuvet to prevent any contamination.
• Do not let the test sample stand too long after reagent
is added or accuracy will be lost.
• Whenever the cuvet is placed into the measurement cell,
it must be completely free of fingerprints, oil or dirt.
Wipe it thoroughly with HI 731318 or a lint-free cloth
prior to insertion.
• It is important that the sample does not contain any
debris. This would corrupt the readings.
• It is possible to take multiple readings in a row, but it
is recommended that a zero reading be taken for each
sample and that the same cuvet is used for zeroing and
measurement.
• It is important to discard the sample immediately after
the reading is taken because the glass might become
permanently stained.
• Shaking the cuvet can generate bubbles in the sample,
causing higher readings. To obtain accurate measure-
ments, remove such bubbles by swirling or by gently
tapping the vial.
• All the reaction times reported in this manual are
referred to 20°C (68°F). As a general rule of thumb,
they should be doubled at 10°C (50°F) and halved at
30°C (86°F).
Battery replacement must only take place in a non-hazardous
area using a 9V alkaline battery.
Simply slide off the battery cover on the back of the meter.
Detach the battery from the terminals and attach a fresh 9V
battery while paying attention to the correct polarity. Replace
the battery and the cover.
9V
SLIDE
OFF
Recommendations for Users
Before using these products, make sure that they are entirely suitable for
the environment in which they are used.
Operation of these instruments in residential area could cause unacceptable
interferences to radio and TV equipments, requiring the operator to take all
necessary steps to correct interferences.
Any variation introduced by the user to the supplied equipment may
degrade the instruments' EMC performance.
To avoid damages or burns, do not perform any measurement in microwave
ovens.
REAGENT SETS
HI 93715-01 Reagents for 100 tests
HI 93715-03 Reagents for 300 tests
OTHER ACCESSORIES
HI 710009 Blue rubber boot
HI 710010 Orange rubber boot
HI 721310 9V battery (10 pcs)
HI 731318 Tissue for wiping cuvets (4 pcs)
HI 731321 Glass cuvets (4 pcs)
HI 731325 Caps for cuvets (4 pcs)
HI 93703-50 Cuvets cleaning solution (230 mL).
MEASUREMENT PROCEDURE
• Turn the meter on by
pressing ON/OFF.
• When the LCD displays
“- - -”, it is ready.
• Fill the cuvet up to 1.5 cm
(¾”) below the rim with
10 mL of unreacted
sample, and replace the
cap.
• Place the cuvet into the
holder and ensure that the
notch on the cap is
positioned securely into the
groove.
• Press ZERO and “SIP” will
appear on the display.
• Wait for a few seconds and
the display will show
“-0.0-”. Now the meter is
zeroed and ready for
measurement.
• Remove the cuvet.
• Add 4 drops of the First
reagent (6 drops in case
of seawater analysis).
• Replace the cap and swirl
the solution.
ON
OFF
ZERO
• Add 4 drops of the Second
reagent (10 drops in case
of seawater analysis).
• Replace the cap and swirl
the solution.
• Reinsert the cuvet into the
instrument.
• Press READ TIMED and the display will show the
countdown prior to the measurement, or, alternatively
wait for 3 minutes and 30 seconds and press READ
DIRECT.
In both cases “SIP” will appear during measurement.
• The instrument directly displays concentration in mg/L of
ammonia nitrogen (NH
3
-N) on the display.
• To convert the reading to mg/L of ammonia (NH
3
),
multiply the display by a factor of 1.214.
INTERFERENCES
Interference may be caused by:
Hardness above 1 g/L
Iron, sulfide, glycine, various aliphatic and aromatic amines
Organic chloramines
Acetone
Aldehydes
READ
TIMED
10 mL
Operational Guide Tips for an Accurate Measurement
Battery Replacement
Accessories
CE Declaration of Conformity
Read the relevant SDS sheets before performing the test.
Safety Data Sheets are available at: www.hannainst.com
Safety Data Sheets